USB modem huawei with micro-controller

[EmbeedSystem]

I have a Huawei USB modem MU 709-s2 that I interface with a STM32F407 Microcontroller.
I’m trying to get PPP working. To do that, I followed the manual of my modem to send the AT commands.
I successfully configured everything. Except that I’m getting garbage after “ATD” . I get the response CONNECT 21600000, then after a moment, I get something like this: ~ÿ}#À!}!} } }4}"}&} } } } }'}"}(...".
What’s the meaning of this garbage?
I want to get the IP address after connection, so I tried to send the AT command to do that, but I get no answer, it seems that the modem can’t respond after connection.
Do you have an idea what’s the next step to do please?

Best regards,

 

[Alabalcho]

The response you get from your modem is more or less the right one. What else you do expect to get after modems do connect? You're supposed to start your PPPoE client daemon on your controller.

 

[EmbeedSystem]

Thank you Alabalcho,
I want to send an AT command after connection to get the IP adress. Then use this adress IP to cuommunicate with a server and my STM32F4.
Best regards,